Procatinator is exactly what it sounds like: a procrastination site featuring cats. Load it, and you will see a screen-size cat gif accompanied by a more-or-less appropriate musical soundtrack. Just try to quit loading cats before the whole day is gone!
The cat you see here was accompanied by "Roller Coaster of Love" by RHCP. Oskar the blind kitten playing with a hairdryer is accompanied by "Winds of Change" by the Scorpions. Links on the left make it easy to reload or grab the URL of a selection you particularly like. This one is another of my favorites. -via Everlasting Blort